$A$ body is moving along a straight line with initial velocity $v_0$. Its acceleration $a$ is constant. After $t$ seconds,its velocity becomes $v$. The average velocity of the body over the given time interval is
- A$\bar{v}=\frac{v^2-v_0^2}{a t}$
- B$\bar{v}=\frac{v^2+v_0^2}{2 a t}$
- C$\bar{v}=\frac{v^2+v_0^2}{a t}$
- D$\bar{v}=\frac{v^2-v_0^2}{2 a t}$
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